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Research Papers: Design and Analysis

Evaluating Plastic Loads in Torispherical Heads Using a New Criterion of Collapse

[+] Author and Article Information
Duncan Camilleri

Department of Mechanical Engineering, University of Strathclyde, 75 Montrose Street, Glasgow, G1 1XJ Scotland, U.K.d.camilleri@strath.ac.uk

Donald Mackenzie, Robert Hamilton

Department of Mechanical Engineering, University of Strathclyde, 75 Montrose Street, Glasgow, G1 1XJ Scotland, U.K.

J. Pressure Vessel Technol 130(1), 011202 (Jan 17, 2008) (8 pages) doi:10.1115/1.2826427 History: Received September 15, 2006; Revised November 08, 2006; Published January 17, 2008

In ASME Design by Analysis, the plastic load of pressure vessels is established using the twice elastic slope criterion of plastic collapse. This is based on a characteristic load-deformation plot obtained by inelastic analysis. This study investigates an alternative plastic criteria based on plastic work dissipation where the ratio of plastic to total work is monitored. Two sample analyses of medium thickness torispherical pressure vessels are presented. Elastic perfectly plastic and strain hardening material models are considered in both small and large deformation analyses. The calculated plastic loads are assessed in comparison with experimental results from the literature.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Twice elastic slope and plastic work criteria

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Figure 3

(a) Elastic and plastic works. (b) Circumradius of three points.

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Figure 5

Schematic diagram of pressure vessels

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Figure 6

Elastic perfectly plastic and strain hardening material models

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Figure 7

Limit load analysis—Vessel 1. (a) PWC criterion. (b) RPWC criterion.

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Figure 8

Small deformation strain hardening model—Vessel 1. (a) PWC criterion. (b) RPWC criterion.

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Figure 9

Large deformation strain hardening model—Vessel 1. (a) PWC criterion. (b) RPWC criterion.

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Figure 10

Small deformation strain hardening model—Vessel 2. (a) PWC criterion. (b) RPWC criterion.

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Figure 11

Large deformation strain hardening model—Vessel 2. (a) PWC criterion. (b) RPWC criterion.

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